Table 2. Parameters used in the numerical simulation.

Symbol	Simulation parameters	Values	Unit
Δt	The time step in numerical simulation	20	μs
N	The total number of scatterers in the voxel	100
NS	The number of static scatterers	10, 20, 30, 40, and 50
NF	The number of flowing/diffusing scatterers	40, 50, 60, 70, and 80
NE	The number of entering/exiting scatterers	N - NS - NF
D	The diffusion coefficient of non-translational movements	2, 4, 6, 8, and 10	μm2/s
v	The speed of translational flow	1, 2, 3, 4, and 5	mm/s
θ	The polar angle of translational flow	0, π/6, π/3, π/2, 2π/3, 5π/6, and π	rad